It doesn't get much more hardcore than writing a game for a computer from my childhood, so 5 stars for theme interpretation, but unfortunately it doesn't seem to be working very well on the Windows version of FUSE, so I couldn't rate anything else... send me a message if you can fix it then I'll try again and update my rating.

A dim memory from the past helped me guess that I had to issue the RUN command after the .tap file loaded, got instructions and a level was generated, but as soon as I make a move my character disappears then all the enemies slowly disappear one by one and then finally an error gets logged (see screenshot).